Crossword Genius

Source of great authority (6)

Ross

I believe the answer is:

oracle

(Other definitions for oracle that I've seen before include "Person of great wisdom, as in Delphi of old" , "Sybil" , "One believed to give divinely-inspired answers" , "Source of information" , "Authority to be consulted" .)

I've seen this clue in The Guardian.
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